| 摘要 |
<p>PURPOSE:To reduce misalarming output and improve the reliability. CONSTITUTION:The hot-wire detector is equipped with a sensor circuit 1 which outputs a 1st pulse having pulse width wider than a 1st specific time and a 2nd pulse within a 2nd specific time after the 1st pulse, a pulse counting timer circuit 2 which resets a 2nd state continuously for a 3rd specific time a little longer than the 2nd specific time unless a pulse is newly inputted in the 2nd state once the 1st pulse is inputted in a 1st state, a 1st gate circuit 3 which erases the pulse inputted in the 2nd state, a 2nd gate circuit 4 which erases the pulse inputted in the 1st state, and a pulse converting circuit 5 which converts the input pulses into pulses having pulse width shorter than the 1st specific time. The output of the sensor circuit 1 is inputted to the 1st gate circuit 3 and pulse converting circuit 5 and the output of the 1st gate is inputted to the pulse counting timer circuit 2; and the output of the pulse converting circuit 5 is inputted to the 2nd gate circuit 4 and the output of the 2nd gate circuit 4 is uses as an alarming output.</p> |
